用am，is，are填空

1. What _____ those? _____ they birds?

2. He _____ my friend. _____ your friend a boy or a girl?

3. This _____ his ruler. Where _____ my ruler?

4. I _____ in Class Three. _____ you in Class Three,too?

5. Those _____ their apples. Where _____ his apples?

下列哪项属重度烧伤

A．烧伤总面积为31%～50%

B．三度烧伤面积10%～19%

C．总烧伤面积21%，伴有休克

D．总烧伤面积19%，伴有中度呼吸道烧伤

E．以上均对